When \( \mathrm{PbO}_{2} \) reacts with conc. \( \mathrm{HNO}_{3} \...

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When \( \mathrm{PbO}_{2} \) reacts with conc. \( \mathrm{HNO}_{3} \), the gas evolved is :
(a) \( \mathrm{NO}_{2} \)
(b) \( \mathrm{O}_{2} \)
(c) \( \mathrm{N}_{2} \)
(Haryana PMT 2009)
(d) \( \mathrm{N}_{2} \mathrm{O} \)
\( \mathrm{P} \)
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